28665577 has 2 divisors, whose sum is σ = 28665578. Its totient is φ = 28665576.

The previous prime is 28665569. The next prime is 28665589. The reversal of 28665577 is 77556682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28419561 + 246016 = 5331^2 + 496^2 .

It is a cyclic number.

It is not a de Polignac number, because 28665577 - 2³ = 28665569 is a prime.

It is not a weakly prime, because it can be changed into another prime (28665677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14332788 + 14332789.

It is an arithmetic number, because the mean of its divisors is an integer number (14332789).

Almost surely, 2^28665577 is an apocalyptic number.

It is an amenable number.

28665577 is a deficient number, since it is larger than the sum of its proper divisors (1).

28665577 is an equidigital number, since it uses as much as digits as its factorization.

28665577 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 705600, while the sum is 46.

The square root of 28665577 is about 5354.0243742441. The cubic root of 28665577 is about 306.0461327060.

The spelling of 28665577 in words is "twenty-eight million, six hundred sixty-five thousand, five hundred seventy-seven".